A gunman early yesterday morning fired nine bullets through the glass front door of B'nai B'rith International Headquarters, the Jewish social service organization at 1604 Rhode Island Ave. NW, D.C. Police reported.

No one was injured by the gunman, who fled in a car. A few minutes later, shortly after 3 a.m., a caller, who said he is a member of the Christian Anti-Zionist League, telephoned The Washington Post and claimed responsibility for the attack.

Police and B'nai B'rith officials say they have never heard of the group.

"Obviously, this is frightening and disturbing, but we have no way of knowning whether it is the activity of a one deranged person or a group," Daniel Thursz, B'nai B'rith executive vice president, said.

Security at the headquarters building near Scott Circle has been "extremely tight" ever since a group of Hanafi Muslims took over the building three years ago, Thursz explained. A security guard was near the door when the 9 millimeter shots were fired, but he was protected by bullet-proof glass, Thursz said.

"Until more evidence is obtained, we cannot see this as anything more than an isolated incident," Thursz said.